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PDF LC78684E Data sheet ( Hoja de datos )
| Número de pieza | LC78684E | |
| Descripción | MP3 Decoder | |
| Fabricantes | Sanyo Semicon Device | |
| Logotipo |  |
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www.DOartdaeSrhinegent4umUb.ceor m: ENN7350
CMOS IC
LC78684E
MP3 Decoder for Compact Disc Players
Overview
The LC78684E integrates, on a single chip, CD-ROM
signal-processing functions, MP3 signal-processing func-
tions, and CD-DA shockproof signal-processing functions.
The LC78684E achieves significant power savings by
implementing signal-processing functions using hard-
wired structures.
A CD player that supports playback of MPEG audio
(MP3) recorded on CD media as well as CD-DA
shockproof playback can be implemented by combining
this IC with a CD DSP, DRAM, and audio D/A converter,
and other circuits.
Features
x MP3 Decoding Functions (MPEG audio standard
[ISO/IEC 11172-3] layer 3)
Decodes to a digital audio signal MP3 data decoded
by the CD-ROM decoder and outputs that audio
signal.
Supports all bit rates, including variable bit rate
operation.
Supports the following sampling rates.
MPEG1 (Fs = 32 K, 44.1 K, 48 K)
MPEG2 (Fs = 16 K, 22.05 K, 24 K)
MPEG2.5 (Fs = 8 K, 11.025 K, 12 K)
Can read out the MPEG header and ancillary data.
Automatically mutes the signal on CRC errors using
an MP3 CRC check function.
External MPEG serial data input function supports
memory card playback.
x CD-ROM Decoding Functions
Supports CD-ROM modes 1 and 2 (forms 1 and 2)
Faithfully reproduces data stored on CD-ROM discs
using CD-ROM error correction functions.
Header and sector management
Supports playback speeds up to 4×.
In addition to data buffering also supports C2 error
flag buffering.
Provides external serial output of decoded CD-ROM
data.
x CD-DA Playback Functions (Shockproof support)
Shockproof operation for about 180 seconds (com-
pressed mode) when 64M DRAM is used.
Shockproof function supports compressed, uncom-
pressed, and data through modes.
VCEC (variable speed) supports up to 4×-speed play-
back.
x Audio Signal Processing
Serial audio signal output using LRCK, BCK, and
DATA signals.
(I²S format, either 16-bit or 20-bit precision PCM
output, data-slot supports 16-bit, 24-bit, and 32-bit
modes)
Digital bass boost function (4 modes), attenuator
function, and muting (f, 12 dB)
Provides a base clock (384 fs) output pin for use with
external digital filters and D/A converters.
x DRAM Interface
Supports the use of from 1M to 64M of external
DRAM (EDO, 2CAS, 16-bit data bus memory)
Supports allocation of a user area in DRAM during
CD-ROM (MP3) playback.
Continued on next page.
Q Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s control
systems, or other applications whose failure can be reasonably expected to result in serious physical
and/or material damage. Consult with your SANYO representative nearest you before using any SANYO
products described or contained herein in such applications.
Q SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
20703RM(OT) No.7350-1/21
1 page  
www.DataSheet4U.com
LC78684E
Pin Functions
Absolute Maximum Ratings at VSS 0 V, AVSS
Parameter
Maximum supply voltage
Input voltage
Output voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VDD max
VIN
VOUT
Pdmax
Topr
Tstg
0V
Conditions
Ratings
0.3 to VSS 4.0
0.3 to VDD1 0.3
0.3 to VDD1 0.3
400
30 to 75
40 to 125
Unit
V
V
V
mW
qC
qC
Allowable Operating Ranges at Ta 30 to 75qC, VSS 0 V, AVSS 0V
Parameter
Supply voltage
High-level input voltage
Low-level input voltage
Operating frequency range
Symbol
VDD1
VDD2
VIH
VIL
Fop
Pin name
DVDD1, DVDD3,
DVDD4, DVDD6, AVDD
DVDD2, DVDD5
MDATA0 to 15,
LRSY, DATAIN,
DATACK, C2FIN,
PW, SBSY, SFSY,
STREQ, STCK,
STDAT, WOK,
CKIN, CE, CL,
CMDIN, RESB
MDATA0 to 15,
LRSY, DATAIN,
DATACK, C2FIN,
PW, SBSY, SFSY,
STREQ, STCK,
STDAT, WOK,
CKIN, CE, CL,
CMDIN, RESB,
TEST1, TEST2
CKIN
Conditions
min
3.0
1.62
0.8 VDD1
0
Ratings
typ
3.3
1.8
16.9344
max
3.6
1.98
VDD1
0.2 VDD1
Unit
V
V
V
V
MHz
No.7350-5/21
5 Page 
www.DataSheet4U.com
CD DSP Interface
CD DSP Interface Timing
LRSY
DATACK
DATAIN
C2FIN
LC78684E
T2
T1h
Fbck
T3
T1l
T4 T5
Parameter
DATACK frequency
DATACK H-level pulse width
DATACK L-level pulse width
LRSY setup time
LRSY hold time
DATA, C2FIN setup time
DATA, C2FIN hold time
Symbol
Fbck
T1h
T1l
T2
T3
T4
T5
Ratings
min typ
30
30
30
30
30
25
: The figure above shows the timings when DATACK rising edge latch is used.
If DATACLK falling edge latch is used, the timings are the same as those for the corresponding setup and hold signal.
max
14.5
Unit
MHz
ns
ns
ns
ns
ns
ns
No.7350-11/21
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